Quote:
Originally Posted by redpoint5
....... Capri- Does a 13% drop in MPG due to tire selection sound reasonable? ......
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The OP seems to be reporting instantaneous fuel economy (based on a gauge on the dash?). If that is the case, then 13% is fairly reasonable. But I don't think you can achieve that as an overall value.
Just for reference, there is a chart that shows how much fuel is used during the 2 EPA tests - and rolling resistance (of the entire car) varies between 4% and 7%. There's a copy of it here:
Barry's Tire Tech - Rolling Resistance and Fuel Economy